The fatal D.C. plane crash has renewed focus on the recent history of crashes and near misses in U.S. airspace.

More than 60 people were killed when an American Airlines regional passenger jet collided with a U.S. Army Black Hawk helicopter on Wednesday and crashed into the frigid Potomac River near Ronald Reagan Washington National Airport.

Figure skaters and coaches returning from the U.S. national championships were aboard the American Airlines flight that collided with a Black Hawk helicopter Wednesday.

Six people associated with Zeghibe’s club in Norwood, Massachusetts, were killed in the plane crash: skater Spencer Lane and his mother, Molly, skater Jinna Han and her mother, Jin, and coaches Evgenia Shishkova and Vadim Naumov, a married couple who were world champion pairs figure skaters from Russia in the 1990s.

Before Wednesday’s crash near Washington, D.C., there had not been a fatal collision involving a commercial aircraft in the United States since 2009.

Several figure skaters, their coaches and family members had been on a flight to Washington after the U.S. Figure Skating Championships in Wichita, Kansas.

Conspiracy theories have arisen online as people look for answers following the plane and helicopter collision.